package com.dymall.gateway.filter;

import com.dymall.common.exception.UnauthorizedException;
import com.dymall.gateway.config.AuthProperties;
import com.dymall.gateway.utils.JwtTool;
import lombok.RequiredArgsConstructor;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.stereotype.Component;
import org.springframework.util.AntPathMatcher;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

import java.util.List;

@Component
@RequiredArgsConstructor
public class AuthGlobalFilter implements GlobalFilter, Ordered {
    private final JwtTool jwtTool;
    private final AuthProperties authProperties;
    private final StringRedisTemplate stringRedisTemplate;
    private final AntPathMatcher antPathMatcher = new AntPathMatcher();


    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        //1、获取request
        ServerHttpRequest request = exchange.getRequest();
        //2、判断是否需要做登录拦截(Path)
        if(isExcude(request.getPath().toString())){
            return chain.filter(exchange);
        }
        //3、获取token
        String token = null;
        List<String> authorization = request.getHeaders().get("authorization");
        if(authorization != null && !authorization.isEmpty()){
            token = authorization.get(0);
        }
        //4、校验并解析token
        Long userId = null;
        try{
            userId = jwtTool.parseToken(token, stringRedisTemplate);
        }
        catch (UnauthorizedException e){
            ServerHttpResponse response = exchange.getResponse();
            response.setRawStatusCode(401);
            return response.setComplete();
        }
        //5、传递用户信息
        String userInfo = userId.toString();
        ServerWebExchange swe = exchange.mutate().request(builder -> builder.header("user-info", userInfo)).build();
        //6、放行
        return chain.filter(swe);
    }

    private boolean isExcude(String path) {
        for(String authProperty : authProperties.getExcludePaths()){
            if(antPathMatcher.match(authProperty, path)){
                return true;
            }
        }
        return false;
    }

    @Override
    public int getOrder() {
        return 0;
    }
}
